Choices so far as to my research are :
1. Alpina
(fitted to my M6, the carbon fiber work is a beauty, the pattern fits perfectly 100% with the roof weave pattern and the interior)
sorry for the low quality , taken by blackberry phone
2. M-Performance :
For Gran Coupe owners we've got the rear brake light along with the rear end of the roof .. while the coupe gets the center brake light in the mid of the trunk so this spoiler fits nicely around the lights .. where the gran coupe would have it go around for no reason with empty space in the middle.
3. Vorstiener :
for pics
http://www.vorsteiner.com/bmw/m-seri...gran-coupe-m6/